MAINTAINERS: Add missing entries for the MPS2 machine

Missed in de343bb632a.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20181125205000.10324-17-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
1 file changed